Improvement in steam-engine-valve devices



w BAXTEIL r Steam Valve; No. 83,444. PaientedOct. 27,1868.

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Witnesses: l'rw l I 5 mica? 4 I fl MPETERs, PHOTO-LITHQGHAPHER, WASHINGTON D c EN .F C

WILLIAM BAXTER, o NEwAEK, NEW JERSEY.

IMPROVEMENT IN STEAM-ENGlNE-VALVE DEVICES.

Specification forming part of Letters Patent No. 83,444, dated October 27, 1868.

To all whom it may concern:

Be it known that I, WILLIAM BAXTER, of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Self-Compensating Steam-Valve; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which draWing- Figure 1 represents a sectional front view of this invention. Fig. 2 is a sectional side elevation thereof.

Similar letters indicate correspondingparts.

This invention consists in controlling the throw of a steam-valve by interposing between the moving cam and the valve a resisting medium, the action of which on the valve increases and decreases according to the speed of the engine, in such a manner that the speed of the engine is regulated by the valve itself,

and without the use of a governor or other de vice of a similar nature.

It consists, further, in the arrangement of a plunger and barrel filled with liquid and provided with a channel connecting its ends, said barrel being placed between the cut-off valve of an engine and the cam or crank shaft, in such a manner that, by the resistance of the liquid, the throw of the cut-off valve is regu-- lated automatically according to the speed of the engine, and that said cut-off valve takes the place of the governor.

It consists, finally, in the arrangement of a regulating-valve in the channel which connects the ends of the barrel, in such amanner that the effect of the resisting-liquid can be adjusted according to the speed of the engine desired.

A represents a steam-cylinder, provided with a piston, B, which connects by a rod, G, with thecrank D-of the shaft E, in the usual manner. F is the slide-valve, which receives its motion from the eccentric G on the crank-shaft, and which is provided with openings at a, through which steam is admitted, at the proper intervals, to the ports b b of the cylinder, in the usual manner. On the back of the slidevalve is fitted the cutoff valve H, to which motion is imparted by the cam or eccentric I.

Between this cam andthe valve H is situated the barrel J, which connects with the cam by a rod, 01, and which contains a plunger or piston, K, that connects by a rod, 6, with the valve H.

When the engine is in motion, the cut-oft valve remains stationary until the barrel J has moved far enough to strike the piston K, and then the cut-off valve moves and cuts off the steam at half-stroke or any other portion of the stroke, according to the amount of play of the piston K in the barrel J.

In order to make the motion of the valve H self-compensating according to the motion of the engine, I provide the barrel J with a channel, f, (see Fig. 2,) which connects its two ends; and if said barrel is filled with water, oil, or other liquid, the motion of the barrel causes this liquid to pass through the channel f from one side of the piston to the other.

By the action of the liquid a certain resistance is produced, which opposes the motion of.

'liquid passes out through the channel f without causing the piston K to move with the barrel J before said barrel strikes or comes in contact with the piston. When the speed of the engine increases, the resistance produced by the liquid increases also, and the piston K is caused to move with the barrel before said barrel comes in actual contact with it, and the steam is cut off at less than half-stroke; and, finally, if the speed of the engine still further increases, the action will be the same as if the channel f were closed. The pistonKwill move with the barrel J, and the steam is cut off at thebeginning of the stroke or, in other words, no steam is permitted to enter the cylinder.

It is obvious that by increasing or decreasing the channel f in the barrel J the resistance produced by the liquid can be regulated to correspond to the required speed of the engine. Thisobject is effected by a regulatingscrew, 9, which enters the side of the barrel J. (See Fig. 2.) By screwing this screw in, the channel f can be partially or wholly closed. Instead of the screw, a valve of any desired description could be used.

From this description it will be seen that the speed of the engine is regulated or controlled entirely by the resistance of the liquid in the barrel J.

It is needless to state that my invention is applicable to steam-valves in general, and not only to the cut-off Valve.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. The piston K and barrel J, in combination with the valve H, substantially as herein described.

2. The regulating-valve g, in combination with the barrel J, piston K, and valve H, substantially as herein set forth.

WILLIAM BAXTER.

Vitnesses LEICESTER ALLEN, W. HAUFF. 

